Picture of Heavy loads Bike Trailer
This is my first trailer, I was inspired by several trailers found on Instructables, picking the best from all of them. I used a corner Aluminium profile, 40x40mm width (1,57 in) and 2mm thick (0,07 in) totally about 8 meters, a square aluminium pipe (40mm width), iron square pipe (30x30mm), tropicalized brackets, rivets, some bolts and nuts. Then I needed 2 16'' front bike wheels, beads (no matter the thickness), screws.
I had to buy more aluminium than needed but the total cost with right quantities is about 50-70 Euro.
as a test, 80 kg, about 175 pounds were smoothly transported. 

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Step 1: What is needed

Picture of What is needed
2 x 16'' bike front wheels
4 x 1mt aluminium corner profile - 2 of them with sides cuts at 45°
4 x 80cm aluminium corner profile - 2 of them with sides cuts at 45°
1 x aluminium square pipe (40mm wide)
10 x tropicalized brackets (4 flat 90°, 4 vertical 90°, 2 linear

4 x corner brackets
about 2m of iron square pipe 30mm wide (that replaced the round pipe in the image that was not working good)
beads (I used the 2cm thick ones)
rivets, screws, bolts and nuts
hand made gimbal

Step 2: Frame

Picture of Frame
After dlilling all the holes, rivet the corner brackets to the aluminium profile, using the 4 pieces cut @ 45°, until a square frame is obtained.
Rivet the 80mm aluminium profile (straight cut) at the center of the external long side to get a Z shaped side.
Add a 90° tropicalized bracket at the center of the bottom profile and grind it to fit in the profile. Cut with a grinder the center hole of the brackets to get a fork where you will fix the wheel hub.
Rivet the 1mt aluminium profile with the straight cut to the frame, at the bottom side, internally, leaving enough space to fit the wheel.
On these profiles, you have to rivet the other two 90° brackets making the same work of the previous.
Add longitudinally the square aluminium pipe at the center of the frame
fugsbuild1 year ago
This is excellent trailer plan I like it. Thank you.
saosport1 year ago
awsome! How much does it weigh? Is it tough to pull?
moaibob (author)  saosport1 year ago
don't know exactly but it's about 25 kg, about 55 pounds, but with an average 18 speed mountain bike it is smooth. I am thinking to change the beads with thinner ones anyway, or find another solution for the sides, i'd like to get below 20 kg (45 lbs).
Nice thanks
Sweet idea :D
ddwight1 year ago
Very ingenious.
moaibob (author) 1 year ago
Thank you all! It means very much to me. As an anticipation, i am working on adding seats for kids, paintwork and led light pack. It'll take a while. stay tuned!
mcraghead1 year ago
Very nice!
rimar20001 year ago
Very good design and painstakingly made, congratulation.
orbit.al1 year ago
best trailer hitch I've seen for bike trailer! Have one of these stashed in the pile of 'shiny' at work. Will be coming home next week.